The state is working toward becoming the first to get 100 percent of its energy from renewable sources. Getting there won’t be easy.
Many municipalities have switched to LED streetlights to save energy and money. But the change still comes at a cost.
A new tool could help cities test whether (and how much) specific energy policies can slow global warming.
Smaller communities are increasingly adopting bike-sharing programs. But they look a lot different than those in big cities.